Question: Can you say which national library has the smallest collection?
Paraphrase: Which national library has the smallest collection?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q22806 . ?ent wdt:P1436 ?obj . ?ent wdt:P31 wd:Q22806} ORDER BY ASC(?obj)LIMIT 5 
Answer: National Library of the Czech Republic, National Library of Catalonia, National Library of the Czech Republic, National Library of the Czech Republic, National Library of the Czech Republic